Can spraying machine



' March 10,'1942. H. c. HoPKlNs 2,275,437

CAN SPRAYING MACHINE Filed March 27, 194C 4 Sheets-Sheet l March 1o, 1942.

zzgr 2 H. C. HOPKINS CAN SPRAYING MACHINE Filed March v2'7, 194C 4 Sheng-sheet 2 March 1o, 1942. 'H Q HOPKMS 2,275,437

' I v CAN`SPRAYING MACHINE` I Filed Marche?, 194C Y' 4 sheets-sheet -5 INVENTQR l [Elli "g2g-eg.

Patented Mar. l0, 1942 I t UNITED STATES. PlrrENT-lv oFFlcE CAN SPRAYING MACHINE Harvey C. Hopkins, Chappaqua, N. Y., asslgnor .to American Can Company, New York, N. Y.,

a corporation of New Jersey Application March 27, 1940, Serial No. 326,273

s claims (o1. 91-45) The present invention relates to an apparatus taken substantially along the broken line V2--v2.in I

for coating cans and has particular reference to Fig.1 andalso showing schematically certain of a coating machine for simultaneously spraying 'the pipe connections with the spraying devices; both interior and exterior surfaces of a can in Fig. 3 is a longitudinal vertical sectional view amanner to insure uniform coating results on 5 taken substantially along the broken line 3-3 successive cans. in Fig. 1, the upper part of the apparatus apl An object of the present invention is the pvropearing as a side elevation when so viewed but vision of a coating apparatus for cans whereinv with parts broken away; l

sprayed material is projected simultaneously on Fig. 3a is a detail in vertical section of one interior and exterior surfaces of a can while it of the valve control devices as 'viewed substanis revolved on its axis. tially along the section line Sa-Sain Fig.' 1,

Another object is the provision-of a can coatdrawn to an enlarged scale; -f

ing apparatus which includes an interior spray.- Fig. 4 is a longitudinal vertical sectional 4,View

ing device adapted for movement inside of a taken from the opposite side of the machine can being coated, the can being revolved and 1- along the section line 4--5 in Fig. 1; and

the interior spraying` device projecting spraying Fig. 5 is a longitudinal vertical sectional detail material in a manner to cover ,the interior wall taken substantially along the line 5--5 in Fig. 1.

Y of the revolving can with a uniform coating and The present invention is exemplified in the also includes an exterior spraying device located apparatus shown in the drawings as a preferred invention will be apparent as it is better underoutside of the revolving can, such exterior sprayform and comprisesa structure for automatically ing device being moved to cover the outside can spraying both the interiorl and exterior of a wall with a uniform coat of spraying material. can A at one and the4 same time, together with A further object of the invention isthe pro- ,actuating valves and other control mechanism vision, in a coating machine of the character whereby only a predetermined amount oi' spray'- described, of control ydevices 'for supplying the 2 lng material is used on each can. interior and exterior spraying devices with spray- A base 2| (Figs. 1, 2 and 3) provides the suping material only as needed so that only the port for the machine parts. A housing 22 iscarproper amount of coating is applied to the can ried directly on they base and surrounds much surfaces being coated. of the gearing and other working parts of the Yet another object is the provision of a coat- 'machine. A table 23' is mounted on the base ing apparatus forcans which provides for rehousing and provides a top for the housing. volving. the can on its longitudinal axis while The table 23 (Fig. 2)' is formed with a horiprojecting the spraying material against its inzumal flat top iv2li which is cut through` in a terior and exterior surfaces, an interior sprayvertically disposed opening 25 andthe top We ing device located inside of the can-having rnoveextends down around this opening as a hub 2g ment along the longitudinal axis of the can A tum tab1e can Support 3|v is mounted on the whereby spraying material is projected against table top 2t and extends down through the table the inside surface of the can as a uniform iilm opening 25 as a sleeve 32 This can support ro, and exterior spraying devices arranged outside tutes Within the opening when the can Ais being of and spaced on opposite sides of the revolving sprayed can having movement parallel to the cans axis can Support M extends laterallyas a at head Wheeby the Spraying. material applied to the or disc 33 and radially disposed grooved blocks d Os tcoi'vlglncan is uniformly dis' 3l are formed on the upper surface of the disc. 45 Can support fingers 35 are bolted to the blocks, Numero mer Objects and advantages f the the latter being slotted for the bolts so that the iingers may be moved in toward the center of 4the disc. for the smaller cans and further out for 'the larger sizes of cans.

stood from tho following description, which, taken in connection with the accompanying drawings,

discloses a preferred embodiment-thereof.

Referring to the drawings:

Figure 1 is a combination top plan and hori- 3| centrally of thesupport and in inverted posizontal sectional view of a coating apparatus emtion. l In such a position the open end of the bodying the pr;sent invention with parts broken can is at the bottom and is spaced above the away; support. Turning of the support 3l thus rotates Fig. 2 is a transverse vertical sectional view the linverted can on its own'axis for both the The can A isl held on the turn-table support main bracket frame I3. The shaft ii also carries a, pinion 45 which meshes with a gear 45 mounted one. lower shaft 41 which is journaled in the bracket frame 43 and is directly beneath and vparallel to the shaft 4i. 4

The shaft 41 is driven by connection withra clutch shaft 5| by means of mitre gears 52, 53 secured to the respective shafts. Shaft 5|, adjacent the gear 53, is journaled in a bearing 55 and its opposite end extends through a sleeve clutch member 55 which in its turn rotates in a bearing 51 also formed as a part of the bracket 43. The clutch member 55 is free on the shaft 5| and at the inside 0I the bearing 51 is enlarged.

Theinner face of this section is serrated to form the section as a tooth-clutch drive member 55. Outside of the bearing, the clutch member 55 is preferably formed into an integral sprocket .mounted in the groove. This collar sUppOrt-s two diametrically opposed pins 55 on which is mounted the upper end of a slide yoke 55. 4Yoke 55 forms a clutch operating feature for sliding the sleeve 5| on its shaft 5| as will be described fully hereafter.

Sleeve 5| along its inner face is serrated or in other words is formed with a notched or toothed end 51. `Such a toothed face is adapted to cooperate with and venga-ge Within the teeth of the clutch member 55. Engagement is made when the sleeve is moved.along its feather connection on the shaft through the medium of the yoke 55.

The sprocket 59 is driven by a chain 1| which passes over the sprocket at one side and over a drive sprocket 12 carried on a short drive shaft 13 journaled in a bracket 14 which is mounted on the base 2| Shaft 13also carries a sprocket 15 and this latter sprocket is driven in any suitable manner as by connection with a motor or other prime mover not shown but through the medium of a chain 15 which takes over. the sprocket. As long as the clutch parts 55, 51 are engaged the rotating clutch member 55 causes a corresponding rotation of the shaft 5| and through 'the various shaft and gearing already described a corresponding rotationl of the turn-table can support 3|. In this way the can to-be sprayed is rotated on its own axis.

Movement for the spraying mechanism, control of the proper valves for the spraying material as well as the clutching of the parts 58, 51.

are brought about through a driving connection operates a chain 81 which engages and rotates a sprocket section 38 of a clutch member 59. This clutch member is loosely mounted on a horizontal shaft 5| (see also Fig. 5) which is journaled in bearings formed in a bracket 92. adjacent the clutch member, and in a bracket 53 near the opposite end of the shaft, these brackets both being mounted upon the base 2|.

The clutch member l! is mounted adjacent to a second clutch member 95 (Fig. 5)- which is keyed to the shaft 5|. When the clutch member |39 is turning on the shaft 5| which is stationary at the time, the clutch members are disconnected. Provision is. made, however, for connecting the clutch member 85 with the member 55 and this is leffected by means of a standard pin clutch device which includes a slidevclutch pin 55 (Figs. 1

and 5) carried in the clutch part l5.

The inner end of the pin under certain conditions is adapted to enter into a bore 51 formed in the adjacent face ofthe clutch member 55. A spring 58 in the outer end of a bore formed in the member 55 tends to push the clutch pin into the bore 51 but is normally held back by the pin clutch device.

The pin clutch de'rice-` is manually controlled so that when it is desired to start the spraying for the can A after it has been properly positioned on the turntable support 3|, it is merely necessary to actuate a foot lever in order to permittheclutchpartstobeconnected. Thiswill also start the can rotating as Ywill now be ex- A plained.

A foot treadle lever device |55 (Figs. 3 and 5) having a foot engaging tread IM at' one end is pivoted at |52 on a lug |53 which extends up from the base 2 i; The free end of foot lever is normally held in raised position by means of a spring |55 which connects at its lower end with the treadle end of the foot lever and at its upper endwithapost |55 carriedinthebasehousing 22. Foot lever Ill carries a plate |55 which provides the seat for a bolt |51 which extends down to one side of the lever. Ihe lower end of the bolt is adapted to engage the loose end of a lever arm |55 which is located alongside being keyed to a rock shaft |55 (see also Fig. 1) which is mounted for oscillation in a bearing |i| formed in the bracket 53.

The rock shaft l|55 .also carries a lever iii (Fig. 5) which is pivotally connected to the lowerend ofasliderod H3 which extends through Normally when the spring ||1 holds the clutch block ||5 in its raised position (Fig. 5) theblock which is wedge shaped, is in thepath of rotation with a second motor, not illustrated, which is j Vthrough a chain 8| (Figs. 1 and 3) which operetes over a sprocket 52 carried 'on a short shaft 83 which is journaled in bearings 5I formed in a i bracket 85 which is mounted on the base 2|.

Shaft 83 also carries a sprocket l5 over which of the clutch pin- 55 and the pin which is slotted near its-head end is held depressed within its seat by the clutch block. When so 'held the clutch member 55 is disconnected from' the clutch member 83.

When the foot 'treadle lll is depressed the Y shaft |55 is rocked and this lowers the rod ||3 AThe clutch pin`l5 is thereupon allowed to move Y sented later.

forward under the `action of its spring 98'y and the forward end ofthe clutch pin thus snaps into the bore 91 of the rotating clutch member 89 as soon as thevbore comes adjacent the pin. This locks the clutch parts 95, 89 together and the shaft 9| also rotates.

The foot treadle IUI usually is released at once and then the spring ||1 returns the `clutch'lblock connect theclutch members together and start Release ofthe foot rotation of the shaft 9|. treadle thereupon returns the clutchv block ||8 into its raised position so that only a single rotation of lthe shaft takes place. To obtain more than one revolution it is necessary to keep the foot treadle-depressed. For most spraying ope/rations this is not needed.

When rotation of the shaft 8| (Fig. 1) takes place, the yoke 66 for connecting the clutch members 61 and 58 is moved so that the can A to be coated and the turn-table can carrier 8| are rotated. This is brought about by a cam |25 which is keyed to the shaft 9|. l A cam groove |26 is formed in the periphery of the cam and causes oscillation of a lever |21 which is plvotally mounted on a pin |28 carried in a bracket |29 projecting'inside of the housing- 22. The inner end of the lever- |21 carries a cam roller |3| which is engaged by the wallsof the cam groove |26. l

Lever |21 is pivotally cqnnecteda't |32-tol a slide bar |33 (Figs. 2 and 5) which extends into the clutch yoke 66. At a certain time in the rotation of the shaft 9|, therefore, the clutch members actuated by the sliding of the yoke 86.

unite the shaft 5| with the driving mechanism and the can carrier 3| and it can then rotate. Provision is made for moving bothl the interior spraying `head and the exterior spraying mem' bers, such movement being effected by gear,"rack and cam connection withl the shaft 9|. This feature will now be considered rst for the inside then for the outside spraying devices.

The interior spray device comprises a vertically disposed pipe |4| (Fig. 2) located on the vertical central axis of the can carrier 3|. This pipe carries a spray nozzle |42 at its upper end.

spray leaves the spray nozzle '|42'in proper condition for application to the interior walls ofv the can. There are a number of satisfactory conventional spraying heads of this type and it is believed that `details of such a mechanism are unnecessary for a clear understanding of the present invention. Morej consideration of its operation and control, however, will be pre- The spray device |45 is mounted on a horizontal bar |46 which extends across the machine below the can carrier 33, this being in the lower part of the housing 22. Bar |46 is securedvat its ends t a pair of slide bars |41 (Figs. 2- and 3) one on each'side of the machine. At its lower end, each slide bar |41 is carried in a slide post |46 which is mounted upon the base 2| and which extends from the base toa position near the lower edge of the table 23. Each slide post is i formed with a groove |49 on the side which faces the cross bar |46 thus providing a slideway for the correspondingslide |41. Slide gibs 5| are fastened to the front face of each post and theseholdside ribs |52, formed as an integral part of each slide bar at its lower end. This construction retains the lower part of theslide bar in sliding position Within its .post.,

Each slide |41 extends up through suitable openingsformedv in the table top 24 and intoan upper slide post |55 (Figs. 2 and 3) 'whicli is mounted upon each side of the table top 24. Each post |55 is slotted along its front face as at |56 and this provides a guidewayfor the upper end of the slide bar. Slide gibs |51 secured to the face of each post |55 retain their slide lbar |41 in sliding position above the table 23.

Each slide |41 above the table top 24 carriesv an atomizing spray head |58 which may be ofv nozzle|6| projects from one side of each spray device |56 and extends into close -proximity to the outer wall of the rotating can carried on the can support. It is from such a nozzle that the atomize'd spray material is forcibly ejected and is directed onto the exterior body wall of the can A. v

The can while held on its rotating carrier 8| is enclosedv within a chamber |-(Figs. 1, 2 and 3). Such achamber is open at the front but is otherwiseconfined within a housing formed by aflower plate |66. which is mounted on the table s top 24 and including top and side walls. At o ne side of the container the side wall is cylindrical Las at |61 and this curved section connects with" A top At the rear end, that is adjacent the cylindrical..

wall part |61, there is an opening |12 which is cut through the rear wall and this opening communicates with the inside of a con'cal pipe |13 connected in turn to a suitable uepipe |14. This provides for withdrawing any volatile fumes which mayA be present as an incident to the spraying operation. 1

The raising and with proper timingmove the two exterior spraying heads |58 vertically in a'direction parallel and relative to the side Wall of the rotating can carried on its turn-table 3|. In this movement nozzles |6| traverse vertical slots |15 cut in the side walls |88. 'I'hese slots are only wide enough to accommodate free sliding -movement of the nozzles. l

'I'his raising and loweringof the slide bars |41 |45 used for the interior spray nozzle |42. Like control slide bar |41 on which it is mounted. A spray lowering of thel sud@ bars |41 is effected by a pinion rack mechanism best illustrated in Fig. 3. l Each slide bar |41 at'its lower end carries a rack |8| the teeth of which mesh with a gear |82 (see also Fig. 1). The two gears |82 for. the two slide bars |41 are keyed to a4 horizontal rock shaft |85 which is journaled in bearings |86 formed in brackets |81 mounted on a side shelf |88 which extends inwardly from the walls 22 on the two opposite sides of the ma? lcam |9| which is formed with a cam groove |92.

The hub of the cam on one face extends forward in a'support section |93 and terminates in an enlarged head |94. An open slide box |95 is mounted on the support hub |93 andextends under the rock shaft |85 as a slide bar |96. The end of the slide bar opposite to the slide box is supported in a groovel |91 .(see also Fig. 2) formed in a support bracket |98 which is mounted on the base 2|.

The upper edge of the forward section of the slide bar |96 is formed with rack teeth 20| which engage a pinion 202 carried on the shaft |85. The slide bar |96 also carries a cam roller 203 (Fig. 1) which operates in the cam groove |92 of the cam |9| and this causes forward and rearE ward movement of the slide with each rotation of the shaft 9|.

the spraying head under slight pressure, as for example 5 to 15 pounds per square inch.

The second pipe line conveys an atomizing air to the spraying head and this air will be under a compression suitable to obtain the desired results. This will depend in large part upon the distance from the nozzle that the spray is to be projected and alsoy as to the consistency of the spraying material. The third pipe line carries a high pressure air supply such as 45 pounds per square inch for opening the valve in the spray head in order to discharge the spraying material.

For convenience, the three spray heads are all connected into the same atomizing air pipe, asA

illustrated in Fig. 2. The interior spray head |45 carries a pipe connection 2|5 which leads tov an air supply pipe 2|6`. Thisy pipe 2| 6 connects with each of the exterior spraying heads |58, the end of the pipe being an integral part of or 'connecting directly with aynipple 2I1 of. each spraying head |58. An atomizing pipe 2|8 connects into the pipe lineI 2|5 and supplies the proper pressure to. the interior and exterior spraying heads.

In order to prevent waste of air when the spray heads -are not in use, provision is made for shutting offthe atomizing air entering into the supply which in turn/is pivoted at 224 to a lug 225 extending down from the bracket 222.

Provision is made for counter-balancing theV I heavy slides |41 and the spraying devices |58 carried thereby so that the raising and lowering of these parts are facilitated. For this purpose the shaft |85 (Fig. 2) carries a grocved pulley 205. A cable 208 .is secured into the pulley and extends vertically from its seat in the groove.

'I'he cable 208 passes over an idler pulley 201 (see also Figs. l and 3) which is mounted upon a short horizontal vshaft 208 carried in brackets 209 secured to the under surface ofthe table top 24. The terminal end of the cable after passing over the idler pulley is connected to a suspension weight 2| This construction vthus provides the desired counterbalance for the shaft. p

The spraying devices |45 and |58 may be of a a chamber for lacquer or other spraying material from which a liquid is passed through a valve and united with atomizing air to produce the proper spraying effect. A convenient m'anner of controlling a valve of this nature is by compressed air suitably piped to the spray head. The internal valve mechanism permits discharge of liquid from the spray nozzle when the controlling air is introduced into the head to open the valve and when the air is c ut off the valve automatically closes thus preventing any discharge of liquid. It is ,thoughtV that since a particular type of sprayinghead is not a part of the present invention, a detailed description of such spraying head is unnecessary. However, in the drawings there' is a schematic showing of various pipe lines leading to the inside spray device |45 and to the two outside spraying devices |58 and s'ome description will now be given of ths feature.

f Each spraying device is thus provided with connections'for three different pipe lines. One

One` end of the lever 223 is connected to aspring 226; the opposite end of which i's anchored in an eye bolt 221 carried on a bracket 228 mounted on the table 23. The opposite end of the lever 223 carries a cam roller 229 which is adapted to ride on a peripheral cam vwall 23| formed on the face cam 9|. this peripheral cam Wall is such as to open the atomizer valve and permit the atomizing air to flow into the supply pipe 2|8 and thus -to the spraying heads as desired.

This airis supplied to the valve 22| by a pipe Y 233 which may lead from a suitable source of compressed air such as a tank or a pump. Since type of commercial spraying head which utilizes valve is needed in thesupply line 214|. This pipe before the rotating and coated can comes to rest 4 and at the time the spraying material is shut off. This prevents blowing air against the freshly coated surfaces.

Since the interior coating of the can A may well be diierent from the exterior coating it i's desirable to provide different-sources of supply for the interior spraying head |45 and the exterior spraying heads |58. supply will now be considered first for the sprayand then for the spraying heads |58.

A pipe 24| A(Fig. 2) which connects with the head |45 conveys the lacquer or other spraying material under 4the proper pressure into the spraying head. Since. the control of 4discharge of the lacquer for the interior spraying nozzle |42 is effected in the spraying head |45 no other therefore leads directly from any'suitable reserpipe line conveysaliquid sprayingmaterial to 76 voir or other source of lacquer supply.

'I'he contour of This liquid material- I needed in the pipe line 244.

The highl pressure air for operating the Viriternal valve mechanisms in the various spray of this valve 259 projects from .the bottom'of the valve casing and when the lever 255 is in the position shown in Fig'. 3a the valve stem and the vent valve 259 are lifted and the valve is thus unseated. When in this position air from the pipe 245 and the passageway'248 is allowed to escape around the top ofthe valve stem and outof the valve casing through a smalllaterally extending port cut in the valve casing. This provides for venting the pipe line.

The end of the lever 255 which is opposite to its connection with the spring 251 carries a cam heads must be properly controlled and timed to produce best results. For suchl control for inside sprayinga pipe 245 (Fig. 2) leadsinto the spray head |45. 'I'his pipe carries the compressed air used for opening its internal valve when the spraying* liquid is to be dispensed and the air supply is indirectly controlled from the shaft 9|,

as will now be explained.,

'I'he pipe 245 leads into a valve casing 246 (see also Figs. 1 and 3a) which is mounted on one side of the machine being carried by a bracket Bracket 241 is secured to the side of the base lhousing 22. The valve casing end of the pipe 245 -leads into an air .channel 248 extending vertically in the valve casing. On the other side of the valve casing is a second air channel 249y which is parallel to channel 248 and these two l channels are connected by a cross-port 250. f

Compressed air is brought into the valve casing 246 from a source of supply, such as a pump or a high pressure tank, by means of a pipe which connects with the upper end of the air Apassage 249. A valve 252 is interposed in the air passage 249 just above the entrance to. the cross-port 250 and is normally closed by means of a spring 253 located in the passage. valve spring bearing on the valve tends at all "times to seat the valve.

The Valve 252 is provided'A with a depending y valve stem 254 which extends down through lthe valve casing and projects beyond the bottom of fthe casing. Provision is made for engaging and lifting the valve stem. 254 to raise the valve 252 .from its seat so that air from the pipe 25| 'can pass freely from the air passage 249 through the port 250 into the air passage 248 and thence out of the pipe,2451to the spray head |45.

This valve actuation is eiected by a lever 255 roller 26 I tothe shaft 9|. The spring 251 insures that the roller 26| engagesthe cam 262 at all times land when the roller 26| is. riding on the low peripheral p'o'rtion of/t/he cam. as illustrated in Fig. 3a, the two Avalve members' 252, 259 are in the position shown in such' figure.

When the lever 255 is shifted by the raised peripheral portion of the cam 262l the valve stem 254 of thev valve 252 is engaged and lifted from its seat. At the same time the valve stem of the vent valve 259 is released byl the lever 255 and its spring 260 closes off the vent port. f

At such time ,therefore air coming into the valve casing 246v from the high pressure supply pipe 25| passes through the passageways 249,250, 248 and into the pipe 245 leading to the sprayl head |45. This" provides for the effective oper-ation for the internal valve mechanism in the spray head so that lacquer'or other spraying material This l is permitted to be discharged from the spray head.

This discharge continues as long as the comn pressed air remains in the pipe 245. Since the shaft 9| makes one complete, revolution for a spraying cycle which begins when the clutch members 89, 95 are connected to rotate the shaft 9 I, a single rotation of the cam '.262 insures opening and closing of the controlling internal discharge valves for the lacquer within the spray- 'ing head |45 all in proper time.

The `air control for outside spraying comprises a pipe 265 (Fig. 2) for each spraying head |58 and these two pipes v are connected into an air line pipe 266. This pipe connects with a high preswhich is pivoted near its center onv a pivot pin 256 carried in lugs extending down from the valve casing 246. One end of the lever 255 is connected to the lower end of a'vertically disposed spring 257, the upper end of which is connected to a v bracket 258'mounted on the side of the table 23. This spring tends to hold the lever in the position illustrated in Fig. 3a and when in such position the valve 252 is 'seated and its stem 254 is Just clear ofthe lever. s

This is the closed position of the parts which control the internal' valve'mechanism within the spray head |45A and at such ltime the lacquer' or spraying material is blockedoif and prevented from issuing from the spraying nozzle |42 of the spraying head. In coming into such a closed position it is desirable' that the pipe 245be vented to atmosphere and this is done in the valve vcasing 246. i. l

A vent valve 259 is seated at the lower end sure supply pipe 261. Like the pipe 245, c'ontrol of the air to pipe 261 is made through a valve cut-off operated from the shaft 9|. For this purpose the pipe 261 also connects into the valve casing 246. The same valve casing thus provides for bothinterior and exterior spraying heads although the passageways'for the two are separate and independent.

The control valve mechanism for the air supl ply leading to theheads |58 is identical with that already described in connection with the interior head |45 but is independently operated. Thus air leading into pipe 261 passes through the same character of passageways and cross-ports 'as those parts v248, 249 and 250 already described.

Opening of the air 'and vent valves is effected by a second lever 268 (Fig. 2) whichcarries its cam 4- roller 269. Cam roller 269 operates on a cam r l21| which is secured to the shaft-9| just inside v of the cam 262.

of the air passage 248 below the cross-port 250 and is normally heldin seated position by a spring' 260 which presses down on the valve. said spring being o also located in the passageway. A stem since 'au of the spraying material projected onto the exterior wall of the can A cannot be' entirelyA confined. there will be a certain-amount which drains down onto the oor of .the chamber |65. Provision is made for catching this excess material.' 'Ihe lower plate' I 66 is formed with side walls (as best illustrated in Fig. 2) s0 This cam roller is adapted to ridev lon a peripheral disc cam 262 which is-keyed that it acts as a drainage pan. At the forward corner of this pan there lis connected a pipe- 212 (Fig. 3) which acts as a catch basin. The lower end of the pipe may be temporarily closed by a plug 213 so that by removing the plug the drainage from the chamber |65 may be drawn off.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will lbe apparent that various changes may be made in the form,

construction and arrangement of the parts without departing from the spirit and scope of the invention or sacricing all' of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. In an apparatus for coating cans, the combination of a rotatable element for supporting-the can, means for .rotating said can supporting element, an interior spraying device for spraying the inside of the can While it revolves. an exterior spraying device located to one side of and adjacent to the revolving can for discharging spraying' material on the outside wall of the can, and means for moving said exterior spraying device parallel to the can body wall while the can revolves to distribute the spraying material over the exterior of the revolving can; thus Acoating both interior and ously.

2. In an apparatus for coating cans, the combination of a rotatable element for supporting the can, means for rotating said can supporting element, an interior spraying device adapted for movement within th'e can held on said support for spraying the inside while the can revolves,

- means for moving said interior spraying device A relative to said can as the latter revolves, an exterior spraying device locatedfto one side of and adjacent tothe revolving can for discharging spraying material on the outside wall of the can, and means for moving said' exterior spraying devicev parallel to the can body wall while th'e can revolves to distribute the spraying material overl .the exterior of the revolving can, thus coating both interior and exterior surfaces simultaneously, and means connected to said can supporting element rotating means and having separateconnection with' said interior and said exterior spraying devices for individually controlling dischargeoi.'v the spraying material from the said spraying devices. i

3. In an apparatus for coating cans, the combination of a rotatable element for supporting the can, means for rotating said can supporting element, an interior spraying device adapted formovement within the can held on said support for spraying the insidewhile the can revolves,l

means for moving said interior spraying4 device relative to said revolving can, a liquid supply pipe connected to said interior spraying device for conducting the spraying material to said device,

.an exterior spraying device located to one side of and adjacent to the revolving can for discharging spraying mater'ial'on the outside wall of the can, a liquid supply pipe conneoted'to said in said interior and in said exterior supply pipes `exterior surfaces simultanefor controlling discharge o'f the. spraying material from said sprayingdevices.

4. In an apparatus for coating cans, the combination of arotatable element for supporting the can,'driving means for rotating said supporting element, an interior 'spraying device adapted for movementwithin the can held on said support for'spraying ,the inside while the can revolves, an exterior -spraying device located to one side of v'andjadjacent to the revolving can for discharging spraying material on the outside .wall of the-can.- and means including a rack and pinion connected by gearing to said can support drivingvmean's for moving said interior and exterior spraying devices parallel to th'e can 'body wall while the can revolves to distribute an even amount 4of spraying material over the exterior of the revolving can, thus coating both interior and exterior surfaces simultaneously.

5. In an apparatus for coating cans, the combination of a rotatable element for supporting the can, driving means for rotating said supporting element, an interior spraying device adapted for movement within the can vheld on said support for spraying the inside while the can revolves, means for conducting spraying material and atomizing air to said interior spraying device, an exterior spraying device located to one side of and adjacent to the revolving can for discharging spraying material on the outside wall of the can, means for conducting spraying material and atomizing air to said exterior spraying device, instrumentalities including a rack and pinion connected by gearing to said can support driving means for moving said interior and exterior spraying devices parallel to the can body wall while the can revolves to' distribute an even amount of spraying material over the exterior of the revolving can, and means for controlling thedischarge of spraying material and the discharge of atomizing air from said spraying devices.

6. In an apparatus for coating cans, the combination of a rotatable element for supporting the can, means for rotating said can supporting element, an interior spraying device adapted for movement within the can held on said support for spraying the inside while the can revolves, a

, housing surrounding said revolving can and havp for discharging spraying material on the outside wall of the can, and means for moving said exterior spraying device back and forth along said slot while the 'can revolves to distribute the spraying material over the exterior of the revolving can, said moving means also moving said interior spraying device relative to the revolving can, thus coating both' interior and exterior surfaces of the can simultaneously.

7. In an apparatus for coating cans, the combination of a rotatable element for supporting the can, drivingr'neans for `rotating said supporting element, 'an interior sprayingdevice adapted formovement within the can held on said support -for spraying the'inside while the canrevolves, means connected 'with said can support drivingmeans for imparting a sliding motion to said'spraying device to project it into e said can and to successively apply an even spray coat to different parts of the interior of the can, a housing surrounding said revolving can and having a pair of diametrically opposed slots said interior spraying device being slidably arranged on opposite sides of the can, a pair o! opposed exterior spraying devices located to one side o1' and adjacent tothe revolving can and projecting inside of said housing slots for discharging spraying material on the outside wall of the canand means also connected with said can support driving means for moving said exterior spraying devices along said slots and inl synchronism with said rotating can and parallel to the can body wall to distribute an even amount of spraying material over the exterior of the revolving can, thus coating both interior and exterior surfaces simultaneously.

8. In an apparatus for coating cans, the combination of'a rotatable element for supporting the can, a power shaft operatively connected with said can supporting element to rotate the same, an interior spraying device adapted for movement within the can held on said support for spraying the inside while the can revolves,

mounted for insertion intorthe can along its longitudinal axis 'for morefuniform coating on the interior walls of the held can, exterior spraying'devices located to one side of and adjacent to the revolving can for discharging spraying material on the outside wall of the can, means for movingi said. exteriorspraying devices pariallel to themn body vwall while the can revolves cnoprniis.l l 

